WO2015008850A1 - Optical film, circularly-polarizing film, and 3d image display device - Google Patents

Abstract

The present invention provides an optical film that suppresses crosstalk during viewing of a 3D image even when applied in a high-definition display panel, a circularly-polarizing film provided with the optical film, and a 3D image display device. This optical film has a patterned optical anisotropy layer. The patterned optical anisotropy layer has first phase difference regions and second phase difference regions having mutually different in-plane lag axis directions and/or in-plane retardations. The first phase difference regions and the second phase difference regions are disposed alternately in stripes within the same plane. The widths of the first phase difference regions and the second phase difference regions are in the range 50-250 µm. The widths of boundary lines, located on the boundaries between the first phase difference regions and the second phase difference regions and comprising non-oriented regions, are in the range 0.1-10 µm.

Description

Optical film, circularly polarizing film, 3D image display device

The present invention relates to an optical film, a circularly polarizing film, and a 3D image display device.

A 3D image display device that displays a 3D (stereoscopic) image requires an optical member for making the right-eye image and the left-eye image into circularly polarized images in opposite directions, for example. As such an optical member, for example, a patterned optical anisotropic element is used in which regions having different slow axes and retardations are regularly arranged in a plane (Patent Document 1).

Japanese Patent No. 3360787

On the other hand, flat panel displays such as liquid crystal display devices (hereinafter also referred to as LCDs) consume less power and are increasingly used as space-saving image display devices year by year.
In the recent flat panel display market, as one of the LCD performance improvement, development to improve the high definition is progressing, and more high definition is demanded especially in the small size such as tablet PC and smart phone. . In addition, the development of next-generation high-definition (4K2K, EBU ratio of 100% or more) of the current TV standard (FHD, NTSC (National Television System Committee) ratio 72% ≒ (EBU European Broadcasting Union) ratio 100%) is also advanced in large size. It has been. Therefore, higher definition of liquid crystal display devices is increasingly required. The same applies to the 3D image display apparatus.
The present inventors applied a conventionally known optical film having a patterned optically anisotropic layer to a high-definition display panel having a small image pitch and observed the 3D image. I found out that

In view of the above circumstances, an object of the present invention is to provide an optical film in which crosstalk during 3D image observation is suppressed even when applied to a high-definition display panel.
Another object of the present invention is to provide a circularly polarizing film having the optical film and a 3D image display device.

As a result of intensive studies on the problems of the prior art, the present inventors have found that the width of the first retardation region and the width of the second retardation region in the patterned optically anisotropic layer, and the boundary located between the two It has been found that the above problem can be solved by adjusting the width of the line.
That is, it has been found that the above object can be achieved by the following configuration.

(1) a display panel;
An optical film having a patterned optical anisotropic layer disposed on the viewing side of the display panel,
The patterned optically anisotropic layer has a first retardation region and a second retardation region in which at least one of the in-plane slow axis direction and the in-plane retardation is different from each other, and the first retardation region and the second retardation region The regions are alternately arranged in stripes within the same plane, and the width of the first retardation region and the width of the second retardation region are 50 to 250 μm,
A 3D image display device in which a width of a boundary line made of a non-oriented region located at (corresponding to) a boundary between a first phase difference region and a second phase difference region is 0.1 to 10 μm.
(2) The 3D image display device according to (1), wherein the in-plane slow axis direction of the first phase difference region and the in-plane slow axis direction of the second phase difference region are orthogonal to each other.
(3) The 3D image display device according to (1) or (2), wherein the in-plane retardation Re (550) at a wavelength of 550 nm of the first retardation region and the second retardation region is 110 to 160 nm.
(4) The 3D image display device according to any one of (1) to (3), wherein a width of the first retardation region and a width of the second retardation region are 50 to 80 μm.
(5) The 3D image display device according to any one of (1) to (4), wherein the patterned optically anisotropic layer is disposed on a transparent support.
(6) The 3D image display device according to any one of (1) to (5), wherein a pixel pitch of the display panel is 10 to 250 μm.
(7) An optical film having a patterned optically anisotropic layer,
The patterned optically anisotropic layer has a first retardation region and a second retardation region in which at least one of the in-plane slow axis direction and the in-plane retardation is different from each other, and the first retardation region and the second retardation region The regions are alternately arranged in stripes within the same plane, and the width of the first retardation region and the width of the second retardation region are 50 to 250 μm,
An optical film in which the width of a boundary line composed of a non-oriented region located at (corresponding to) the boundary between the first retardation region and the second retardation region is 0.1 to 10 μm.
(8) The optical film according to (7), wherein the in-plane slow axis direction of the first retardation region and the in-plane slow axis direction of the second retardation region are orthogonal to each other.
(9) The optical film according to (7) or (8), wherein the in-plane retardation Re (550) at a wavelength of 550 nm of the first retardation region and the second retardation region is 110 to 160 nm.
(10) The optical film according to any one of (7) to (9), wherein the width of the first retardation region and the width of the second retardation region are 50 to 80 μm.
(11) The optical film according to any one of (7) to (10), wherein the patterned optically anisotropic layer is disposed on the transparent support.
(12) The optical film according to any one of (7) to (10), and a polarizing film,
One of the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region forms an angle of + 45 ° with respect to the transmission axis of the polarizing film. A circularly polarizing film in which the other of the in-plane slow axis of the one retardation region and the in-plane slow axis of the second retardation region forms an angle of −45 °.

According to the present invention, it is possible to provide an optical film in which crosstalk during 3D image observation is suppressed even when applied to a high-definition display panel.
Moreover, according to this invention, the circularly-polarizing film which has the said optical film, and a 3D image display apparatus can also be provided.

FIG. 6 is a schematic diagram in which left and right eye image pixels of a display panel and left and right eye image retardation regions of a conventional stripe-patterned optically anisotropic layer are arranged in correspondence with each other. It is the schematic diagram which matched and arrange | positioned the left-eye image pixel which made the conventional black matrix thick, and the right-and-left image phase difference area | region of the conventional striped pattern optically anisotropic layer. It is the schematic diagram arrange | positioned by reducing the film thickness of the glass between the pixel for left-right eyes of the conventional display panel, and the phase difference area | region for right-and-eye images of the conventional stripe pattern optically anisotropic layer. It is a top view which shows an example of a pattern optical anisotropic layer. It is the schematic which shows an example of the relationship between the in-plane slow axis of a pattern optically anisotropic layer, and the transmission axis of a polarizing film. 1 is a schematic cross-sectional view of a 3D image display device 1 manufactured in Example 1. FIG. 6 is a schematic diagram showing the arrangement of wire grid polarizers in Comparative Example 1. FIG. It is a schematic diagram which shows the method of measuring the width | variety of a boundary line.

Hereinafter, the present invention will be described in detail. In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.
Further, in the present specification, regarding the angle (for example, an angle such as “90 °”) and the relationship (for example, “orthogonal”, “parallel”, “crossing at 45 °”, etc.), the technical field to which the present invention belongs. The range of allowable error is included. For example, it means that the angle is within the range of strict angle ± 10 °, and the error from the strict angle is preferably 5 ° or less, and more preferably 3 ° or less.

Re (λ) and Rth (λ) represent in-plane retardation at wavelength λ and retardation in the thickness direction, respectively. Re (λ) is measured with KOBRA 21ADH or WR (manufactured by Oji Scientific Instruments) by allowing light of wavelength λ nm to be incident in the normal direction of the film. In selecting the measurement wavelength λnm, the wavelength selection filter can be exchanged manually, or the measurement value can be converted by a program or the like. Details of the method for measuring Re (λ) and Rth (λ) are described in paragraphs 0010 to 0012 of JP2013-041213A, the contents of which are incorporated herein by reference. In addition, in this specification, when there is no special mention about a measurement wavelength, a measurement wavelength is 550 nm.

Below, the suitable aspect of the optical film of this invention is explained in full detail.
First, the problems of the prior art and the features of the present invention will be described in detail.
In a 3D image display device using an optical film having a patterned optically anisotropic layer, usually, pixels for left and right eye images present in a display panel unit such as a liquid crystal panel, and right and left eye images of a patterned optically anisotropic layer These phase difference regions (first phase difference region and second phase difference region) need to be laminated in correspondence with each other. More specifically, an optical film, a display panel, and an optical film having an optically anisotropic layer (hereinafter also referred to as a striped pattern optically anisotropic layer) having a phase difference region for left and right eye images arranged in a stripe shape. When combining, it is common that the periodic direction of the pattern (the direction in which the different phase difference regions in the stripe form are alternately replaced) coincides with the vertical direction (vertical direction) of the display surface. FIG. 1 is a partially enlarged cross-sectional view in which left and right eye image pixels of a display panel portion and left and right eye image retardation regions of a conventional stripe-patterned optically anisotropic layer are arranged in correspondence with each other. Note that the left and right eye image retardation regions of the striped pattern optically anisotropic layer correspond to a first retardation region and a second retardation region described later, respectively.

1 includes a display panel 12, a glass substrate 14, a polarizing film 16, and a striped pattern optically anisotropic layer 18 in this order. In the display panel 12, left-eye image pixels (L) and right-eye image pixels (R) are alternately arranged, and black is placed between the left-eye image pixels (L) and the right-eye image pixels (R). A matrix 20 is usually arranged. In addition, the left-eye image phase difference region (L) and the right-eye image phase difference region (R) are alternately arranged in the stripe pattern optical anisotropic layer 18, and the left-eye image pixels in the display panel 12 are respectively arranged. It is arranged at a position facing (L) and the right-eye image pixel (R). In the striped pattern optically anisotropic layer 18, a boundary line 22 that is a non-oriented region exists between the left-eye image retardation region (L) and the right-eye image retardation region (R).

The light indicated by the arrow A in FIG. 1 is emitted from the right-eye image pixel (R) inside the display panel 12 and passes through the right-eye image retardation region (R) of the striped pattern optically anisotropic layer 18. A normal right eye image pixel is created. On the other hand, the light indicated by the arrow B is emitted from the right-eye image pixel (R) inside the display panel and passes through the boundary line 22. Unlike the phase difference region for the left and right eye images, the boundary line 22 does not have uniform optical anisotropy, and thus the light that has passed through causes crosstalk. These phenomena of arrows A to B occur similarly in the left-eye image pixel (L). That is, the present inventors have found that the crosstalk caused by the boundary indicated by the arrow B is worsened in the left-right eye phase difference regions (L, R) as the width of the boundary is wider.
In addition, in order to suppress a decrease in luminance due to high definition in recent years, there is a tendency to narrow the black matrix width of the color filter arranged in the liquid crystal cell. There is a concern that the deterioration of the crosstalk due to the boundary line becomes remarkable. That is, in order to achieve high definition without lowering luminance, it is necessary to improve crosstalk when the black matrix width is narrowed.
In the present invention, based on the above knowledge, the widths of the first retardation region and the second retardation region corresponding to the left and right eye image retardation regions in the stripe pattern optical anisotropic layer are adjusted to predetermined values. At the same time, it has been found that the above-described crosstalk can be reduced by adjusting the width of the boundary line to a predetermined value that is smaller than the conventional one.

In order to improve the crosstalk, for example, the width of the black matrix 20 of the color filter arranged in the display panel 12 as shown in the 3D image display device 10b of FIG. A method for blocking the components (for example, Japanese Patent Application Laid-Open Nos. 2011-164563 and 2011-34045) has been proposed, but this causes a decrease in luminance, which is disadvantageous in increasing the resolution.
As another means, the thickness of the glass substrate 14 between the display panel 12 and the stripe pattern optical anisotropic layer 18 as shown in the 3D image display device 10c of FIG. A method of reducing a component passing through the boundary line 22 of the striped pattern optically anisotropic layer 18 by narrowing the interval between the panel 12 and the striped pattern optically anisotropic layer 18 (for example, JP-A-10-268233) ) Has been proposed. Although this method does not reduce the luminance, it is necessary to significantly reduce the thickness of the glass substrate 14 in order to improve the crosstalk. As a result, the impact resistance of the 3D image display device 10c is reduced, and the glass substrate 14 is handled. Yield decreases due to the decrease in sex.

<Optical Film (Optical Film for 3D Image Display Device)>
Hereinafter, the optical film of the present invention will be described in detail.
FIG. 4 is a top view showing an example of the patterned optical anisotropic layer (hereinafter also referred to as a stripe-shaped patterned optical anisotropic layer) 100 in the optical film of the present invention. 110 denotes a first retardation region. , 120 indicates a second phase difference region, and 130 indicates a boundary line that is a boundary between the first phase difference region and the second phase difference region. The arrows in the first phase difference region 110 and the second phase difference region 120 indicate the directions of the in-plane slow axes. The reference numerals in the drawings are common to the following drawings unless otherwise specified.
Further, FIG. 4 is a schematic diagram, and this is not the most appropriate dimension ratio in order to easily explain the relationship between the first phase difference region 110, the second phase difference region 120, and the boundary line 130. A preferable range of these dimensional ratios will be described later.

The first phase difference region and the second phase difference region are alternately arranged in stripes within the same plane, and the first phase difference region and the second phase difference region are in the in-plane slow axis direction and in-plane. At least one of the retardations is different from each other. As described above, the optical film of the present invention is disposed outside the viewing side of the display panel together with the polarizing film, and the polarized image that has passed through each of the first retardation region and the second retardation region of the patterned optical anisotropic layer. Is recognized as an image for the right eye or the left eye through polarized glasses or the like.
It is preferable that the first phase difference region and the second phase difference region have the same shape. Moreover, it is preferable that each arrangement | positioning is equal. Further, the centers of the widths of the first phase difference region and the second phase difference region may coincide with the centers of the pitch widths of the left-eye image pixel (L) and the right-eye image pixel (R) of the display panel. Preferably, as a distribution including variations, the difference in the center position (the difference in position between the center of the phase difference region and the center of the image-like pixel) is preferably 30 μm or less, more preferably 15 μm or less, and further preferably 5 μm or less. preferable. Moreover, in this embodiment, the stripe may be formed in the longitudinal direction of the optical film, or may be formed in a direction perpendicular to the longitudinal direction.

In FIG. 4, the first retardation region 110 and the second retardation region 120 have in-plane slow axes that are orthogonal to each other. FIG. 4 shows an aspect in which the in-plane slow axis direction of the first phase difference region 110 and the in-plane slow axis direction of the second phase difference region 120 are orthogonal to each other. The angle formed between the in-plane slow axis and the in-plane slow axis of the second retardation region 120 is preferably 70 to 110 °, more preferably 80 to 100 °, and most preferably 90 °.
The in-plane retardation Re (550) with a wavelength of 550 nm of the first retardation region 110 and the second retardation region 120 is not particularly limited, but is preferably 110 to 160 nm, more preferably 120 to 150 nm, and further preferably 125 to 140 nm. preferable. Even when the optical film includes other layers (for example, a transparent support) other than the patterned optically anisotropic layer, it is preferable that the entire optical film exhibits the above in-plane retardation range.
In addition, when the optical film includes a transparent support described later, the total of Rth of the transparent support and Rth of the patterned optically anisotropic layer preferably satisfies | Rth | ≦ 20 nm. Preferably satisfies −150 nm ≦ Rth (630) ≦ 100 nm.

In FIG. 4, W1 is the width of the first phase difference region 110, W2 is the width of the second phase difference region 120, and W3 is located at the boundary between the first phase difference region and the second phase difference region (corresponding to ) The width of the boundary line 130, that is, the distance between one end of the first phase difference region 110 and one end of the second phase difference region 120. Although the boundary line 130 is narrow, unlike the first phase difference region 110 and the second phase difference region 120, the boundary line 130 is intended to be a region where the phase difference characteristic is broken. That is, unlike the first retardation region 110 and the second retardation region 120, the boundary line 130 is a non-alignment region (boundary region) in which the liquid crystalline compound does not form a uniform alignment, and light leakage is not caused. Cause. In other words, the boundary line 130 is a non-oriented region in which the liquid crystal compound is aligned in an arbitrary direction, and does not include an aligned region (domain).
In the optical film 100, W1 and W2 are 50 to 250 μm, respectively. Among these, 50 to 130 μm is preferable, and 50 to 80 μm is more preferable in that the occurrence of crosstalk is further suppressed. If W1 and W2 are outside the above ranges, the occurrence of crosstalk cannot be suppressed when applied to a high-definition display panel. The difference between W1 and W2 is not particularly limited, but is preferably 0 to 5 μm and more preferably 0 to 1 μm from the viewpoint of suppressing the occurrence of crosstalk. The width W3 of the boundary line is 0.1 to 10 μm, and is preferably 0.1 to 8 μm, more preferably 0.1 to 5 μm from the viewpoint of suppressing the occurrence of crosstalk. When the width W3 of the boundary line exceeds 10 μm, crosstalk is not sufficiently suppressed, and the image quality of the 3D image is inferior.
In addition, the measuring method of W1, W2, and W3 includes the method of measuring by polarization microscope observation. For example, the patterned optically anisotropic layer (patterned optically anisotropic layer in which the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region are orthogonal to each other) Polarization microscope so that the in-plane slow axis of either the phase difference region or the second phase difference region is parallel to one of the transmission axes of the two polarizing plates whose transmission axes are combined in an orthogonal position Installed on the sample stage (ECLIP E600W POL manufactured by NIKON). At this time, the first phase difference region and the second phase difference region are displayed in black. On the other hand, since the boundary line is not oriented, the light is not blocked and is displayed in white, so that each region can be specified. As a measuring method of the range of the boundary line, as described above, a polarizing microscope is used so as to be parallel to one of the transmission axes of two polarizing plates combined in an orthogonal position. As a procedure, a polarizing optical microscope is used to place a patterned optical anisotropic layer as a sample between two polarizing plates whose transmission axes are combined in an orthogonal position. The observation view in which the first phase difference region is displayed in black and the observation view in which the second phase difference region is displayed in black are compared with each other by rotating the image in a plane that is vertical. In both of the figures, a region that is white display corresponds to a boundary line that is a non-oriented region.
Next, the image observed from the polarizing microscope is taken into a PC from a digital camera (NIKON DIGITAL CAMERA DXM1200) attached to the polarizing microscope, and using the image analysis software WinROOF (Mitani Corporation), the first phase difference region, The second phase difference region and the width of the boundary line are measured. As a specific measuring method, for example, when measuring the width of the boundary line, first, as shown in FIG. 8, observation is performed with a polarizing microscope so that the boundary line 130 is near the center. In that case, as shown in FIG. 8, it observes so that the direction where the boundary line 130 extends may become an up-down direction. Next, in the observation view, a straight line X connecting the vertices of the two convex portions protruding to the leftmost side among the convex portions protruding to the left side of the boundary line 130 is drawn. Next, a line (in the drawing, an arrow) is drawn from an arbitrary point Y on the straight line X to the right end of the boundary line 130 in a direction orthogonal to the straight line X, and the length is calculated. . The length is calculated at 10 points from an arbitrary point Y at intervals of 50 μm (in the figure, D is 50 μm), and the length at the obtained 10 points is arithmetically averaged to obtain the width A of the boundary 130. Ask. Further, the above observation is performed at three arbitrary positions of the patterned optically anisotropic layer, and the width A of the boundary line 130 obtained in each observation drawing is further arithmetically averaged to obtain the boundary line width W3.
The operation of drawing the straight line X and the measurement of the length from the straight line X to the right end of the boundary line 130 are performed using WinROOF.
The same operation is performed on the first phase difference region 110 and the second phase difference region 120 to obtain W1 and W2.
In addition, although the aspect which the meandering line 130 meanders is disclosed in FIG. 8, it is not limited to this aspect, A linear form may be sufficient.

The pattern optically anisotropic layer preferably contains a liquid crystal compound.
Examples of the method for forming the patterned optically anisotropic layer containing a liquid crystalline compound include a method of fixing the liquid crystalline compound in an aligned state. In this case, as a method for immobilizing the liquid crystal compound, a method of polymerizing and immobilizing the liquid crystal compound having an unsaturated double bond (polymerizable group) as the liquid crystal compound is preferably exemplified. The For example, a pattern optical anisotropic layer forming composition containing a liquid crystal compound having an unsaturated double bond (polymerizable group) is applied directly or via an alignment film on a transparent support, and then irradiated with ionizing radiation. And a method of fixing (polymerizing) the liquid crystalline compound by the method described above. The patterned optically anisotropic layer may have a single layer structure or a laminated structure.
The kind of unsaturated double bond contained in the liquid crystal compound is not particularly limited, and a functional group capable of addition polymerization reaction is preferable, and a polymerizable ethylenically unsaturated group or a ring polymerizable group is preferable. More specifically, a (meth) acryloyl group, a vinyl group, a styryl group, an allyl group, etc. are mentioned preferably, and a (meth) acryloyl group is more preferable.

In general, liquid crystal compounds can be classified into a rod-shaped type and a disk-shaped type based on their shapes. In addition, there are low and high molecular types, respectively. Polymer generally refers to a polymer having a degree of polymerization of 100 or more (Polymer Physics / Phase Transition Dynamics, Masao Doi, 2 pages, Iwanami Shoten, 1992). In the present invention, any of a rod-like liquid crystalline compound and a discotic liquid crystalline compound (discotic liquid crystalline compound) can be used. Two or more kinds of rod-like liquid crystalline compounds, two or more kinds of disc-like liquid crystalline compounds, or a mixture of a rod-like liquid crystalline compound and a disk-like liquid crystalline compound may be used. In order to fix the liquid crystalline compound, it is more preferable to use a rod-like liquid crystalline compound having a polymerizable group or a discotic liquid crystalline compound, and the liquid crystalline compound has 2 polymerizable groups in one molecule. It is more preferable to have the above. When the liquid crystal compound is a mixture of two or more, it is preferable that at least one liquid crystal compound has two or more polymerizable groups in one molecule.
As the rod-like liquid crystal compound, for example, those described in claim 1 of JP-T-11-53019 and paragraphs [0026] to [0098] of JP-A-2005-289980 can be preferably used. As the tick liquid crystalline compound, for example, those described in paragraphs [0020] to [0067] of JP-A-2007-108732 and paragraphs [0013] to [0108] of JP-A-2010-244038 are preferably used. However, it is not limited to these.

In order to make the in-plane retardation in the patterned optically anisotropic layer within the above range, the alignment state of the liquid crystalline compound may be controlled. At this time, when the rod-like liquid crystalline compound is used, it is preferable to fix the rod-like liquid crystalline compound in a horizontally aligned state. When the discotic liquid crystalline compound is used, the discotic liquid crystalline compound is vertically aligned. It is preferable to fix in a state. In the present invention, “the rod-like liquid crystal compound is horizontally aligned” means that the director of the rod-like liquid crystal compound and the layer surface are parallel, and “the discotic liquid crystal compound is vertically aligned” means the discotic liquid crystal. This means that the disk surface and the layer surface of the functional compound are perpendicular. It is not strictly required to be horizontal or vertical, but each means a range of ± 20 ° from an accurate angle. It is preferably within ± 5 °, more preferably within ± 3 °, even more preferably within ± 2 °, and most preferably within ± 1 °.
Moreover, in order to make a liquid crystalline compound into a horizontal alignment and a vertical alignment state, you may use the additive (alignment control agent) which accelerates | stimulates a horizontal alignment and a vertical alignment. Various known additives can be used as the additive.

Although the following suitable aspects are illustrated as a formation method of the above-mentioned pattern optically anisotropic layer, it can form using various well-known methods, without being limited to these.
The first preferred embodiment utilizes a plurality of actions for controlling the alignment of the liquid crystal compound, and then eliminates any action by an external stimulus (heat treatment, etc.) to make the predetermined alignment control action dominant. Is the method. As the above method, for example, the liquid crystalline compound is brought into a predetermined alignment state by the combined action of the alignment control ability by the alignment film and the alignment control ability of the alignment controller added to the liquid crystalline compound, and then fixed. After forming one phase difference region, any action (for example, action by the alignment control agent) disappears by external stimulation (heat treatment, etc.), and the other orientation control action (action by the alignment film) dominates. Thus, another alignment state is realized and fixed to form the other retardation region. Details of this method are described in paragraphs [0017] to [0029] of Japanese Patent Application Laid-Open No. 2012-008170, the contents of which are incorporated herein by reference.

The second preferred embodiment is an embodiment using a pattern alignment film. In this embodiment, pattern alignment films having different alignment control capabilities are formed, a liquid crystalline compound is disposed thereon, and the liquid crystalline compound is aligned. The liquid crystalline compounds achieve different alignment states depending on the alignment control ability of the pattern alignment film. By fixing each alignment state, the pattern of the 1st and 2nd phase difference area | region is formed according to the pattern of an alignment film. The pattern alignment film can be formed using a printing method, mask rubbing for the rubbing alignment film, mask exposure for the photo alignment film, or the like. A method using a printing method is preferable in that large-scale equipment is not required and manufacturing is easy. Details of this method are described in paragraphs [0166] to [0181] of JP2012-032661A, the contents of which are incorporated herein by reference.

As a third preferred embodiment, for example, a photo acid generator is added to the alignment film. In this example, a photoacid generator is added to the alignment film, and pattern exposure exposes a region where the photoacid generator is decomposed to generate an acidic compound and a region where no acid compound is generated. The photoacid generator remains almost undecomposed in the non-irradiated portion, and the interaction between the alignment film material, the liquid crystal compound, and the alignment control agent added as necessary dominates the alignment state, and the liquid crystal compound Is oriented in a direction whose slow axis is perpendicular to the rubbing direction. When the alignment film is irradiated with light and an acidic compound is generated, the interaction is no longer dominant, the rubbing direction of the rubbing alignment film controls the alignment state, and the liquid crystalline compound has its slow axis parallel to the rubbing direction. To parallel orientation. As the photoacid generator used in the alignment film, a water-soluble compound is preferably used. Examples of photoacid generators that can be used include Prog. Polym. Sci. 23, page 1485 (1998). As the photoacid generator, pyridinium salts, iodonium salts and sulfonium salts are particularly preferably used. Details of this method are described in Japanese Patent Application No. 2010-289360, the contents of which are incorporated herein by reference.

The thickness of the patterned optically anisotropic layer is not particularly limited, but is preferably 0.1 to 10 μm and more preferably 0.1 to 5 μm from the viewpoint that the optical film can be made thinner.

The optical film of the present invention may contain a layer other than the patterned optically anisotropic layer.
For example, a transparent support may be included. That is, the optical film may be an embodiment having a transparent support and the patterned optically anisotropic layer disposed on the transparent support. By providing the transparent support, the mechanical strength of the optical film is improved.
Examples of the material for forming the transparent support include polycarbonate polymers, polyester polymers such as polyethylene terephthalate and polyethylene naphthalate, acrylic polymers such as polymethyl methacrylate, polystyrene, acrylonitrile / styrene copolymer (AS resin), and the like. Styrene polymer, polyolefin polymer such as polyethylene, polypropylene, ethylene propylene copolymer, vinyl chloride polymer, amide polymer such as nylon and aromatic polyamide, imide polymer, sulfone polymer, polyethersulfone polymer , Polyether ether ketone polymer, polyphenylene sulfide polymer, vinylidene chloride polymer, vinyl alcohol polymer, vinyl butyral polymer, It relates polymers, polyoxymethylene polymers, and epoxy polymers.

As a material for forming the transparent support, a thermoplastic norbornene resin can be preferably used. Examples of the thermoplastic norbornene-based resin include ZEONEX, ZEONOR manufactured by Nippon Zeon Co., Ltd., and ARTON manufactured by JSR Corporation.
In addition, as a material for forming the transparent support, a cellulose polymer represented by triacetyl cellulose (hereinafter referred to as cellulose acylate) can also be preferably used.

The in-plane retardation Re (550) at a wavelength of 550 nm of the transparent support is not particularly limited, but Re (550) as a laminate with the patterned optically anisotropic layer is 110 in that the effect of the present invention is more excellent. Is preferably 160 nm, more preferably 120 nm to 150 nm, and particularly preferably 125 nm to 140 nm.
The retardation Rth (550) in the thickness direction at a wavelength of 550 nm of the transparent support is not particularly limited, but Rth (550) as a laminate with the patterned optical anisotropic layer is 0 in that the effect of the present invention is more excellent. Is preferably 20 nm, more preferably 0 to 10 nm, and particularly preferably 0 to 5 nm.
The thickness of the transparent support is not particularly limited, but is preferably 1 to 60 μm and more preferably 1 to 40 μm from the viewpoint that the thickness of the optical film can be reduced.
Various additives (for example, optical anisotropy adjusting agent, wavelength dispersion adjusting agent, fine particles, plasticizer, ultraviolet absorber, deterioration preventing agent, release agent, etc.) may be added to the transparent support. it can.

Further, if necessary, an alignment film may be provided between the transparent support and the patterned optically anisotropic layer. By providing the alignment film, it becomes easier to control the alignment direction of the liquid crystalline compound in the patterned optically anisotropic layer.
The alignment film generally contains a polymer as a main component. The polymer material for alignment film is described in many documents, and many commercially available products can be obtained. The polymer material used is preferably polyvinyl alcohol or polyimide, and derivatives thereof. In particular, modified or unmodified polyvinyl alcohol is preferred. For the alignment film that can be used in the present invention, refer to the modified polyvinyl alcohol described in WO01 / 88574A1, page 43, line 24 to page 49, line 8, and patent No. 3907735, paragraphs [0071] to [0095]. be able to. The alignment film is usually subjected to a known rubbing treatment. That is, the alignment film is usually preferably a rubbing alignment film that has been rubbed.
Although the thickness of the alignment film is preferably thin, it is possible to provide alignment ability for forming the patterned optical anisotropic layer, and to reduce the surface irregularities of the transparent support, thereby providing a uniform pattern optical anisotropy. A certain thickness is required from the viewpoint of forming a layer. Specifically, the thickness of the alignment film is preferably 0.01 to 10 μm, more preferably 0.01 to 1 μm, and still more preferably 0.01 to 0.5 μm.
In the present invention, it is also preferable to use a photo-alignment film. The photo-alignment film is not particularly limited, and those described in paragraphs [0024] to [0043] of WO 2005/096041 and trade name LPP-JP265CP manufactured by Roli technologies can be used.

The optical film of the present invention may have an antireflection layer. The antireflection layer is preferably an antiglare layer, but may be a low refractive index layer, a medium refractive index layer, or a high refractive index layer.
An anti-glare layer contains a binder and translucent particles for imparting anti-glare properties, and surface irregularities are formed by the projections of the translucent particles themselves or by projections formed of an aggregate of a plurality of particles. It is preferable that it is a thing.

The refractive index of the high refractive index layer is preferably 1.70 to 1.74, more preferably 1.71 to 1.73. The refractive index of the middle refractive index layer is adjusted to be a value between the refractive index of the low refractive index layer and the refractive index of the high refractive index layer. The refractive index of the middle refractive index layer is preferably 1.60 to 1.64, and more preferably 1.61 to 1.63. The low refractive index layer preferably has a refractive index of 1.30 to 1.47. In the case of a multilayer thin film interference type antireflection film (medium refractive index layer / high refractive index layer / low refractive index layer), the refractive index of the low refractive index layer is preferably 1.33 to 1.38. More preferably, it is 35 to 1.37.
The high refractive index layer, medium refractive index layer, and low refractive index layer are formed by a chemical vapor deposition (CVD) method or a physical vapor deposition (PVD) method, particularly a vacuum vapor deposition method or a sputtering method, which is a kind of physical vapor deposition method, and an inorganic substance. Although a transparent oxide thin film can be used, a method using all wet coating is preferred.
As the high refractive index layer, medium refractive index layer, and low refractive index layer, those described in paragraphs [0197] to [0211] of JP-A-2009-98658 can be used.

<Circularly polarizing film (circularly polarizing film for 3D image display device)>
The optical film described above can be used as a circularly polarizing film by combining with the polarizing film.
First, the polarizing film used will be described in detail.

The polarizing film (polarizer layer) may be a member having a function of converting natural light into specific linearly polarized light. For example, an absorptive polarizer can be used.
The type of the polarizing film is not particularly limited, and a commonly used polarizing film can be used. For example, any of an iodine-based polarizing film, a dye-based polarizing film using a dichroic dye, and a polyene-based polarizing film Can also be used. The iodine-based polarizing film and the dye-based polarizing film are generally produced by adsorbing iodine or a dichroic dye to polyvinyl alcohol and stretching it.
In addition, it is common that a polarizing film is used as a polarizing plate by which the protective film was bonded on both surfaces.

Although the manufacturing method in particular of a circularly-polarizing film is not restrict | limited, For example, it is preferable that the said optical film and polarizing film include the process of laminating | stacking continuously in a respectively elongate state. The long polarizing plate is cut according to the size of the screen of the image display device used.

Note that one of the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region forms an angle of + 45 ° with respect to the transmission axis of the polarizing film, and is relative to the transmission axis of the polarizing film. The other of the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region preferably forms an angle of −45 °. With such a configuration, right-handed circularly polarized light and left-handed circularly polarized light can be accurately realized. FIG. 5 is a diagram showing the above-described embodiment, and shows the relationship between the transmission axis of the polarizing film 140 and the in-plane slow axis of the patterned optically anisotropic layer 100, and the transmission axis of the polarizing film 140, The in-plane slow axes of the first retardation region 110 and the second retardation region 120 of the patterned optically anisotropic layer 100 form angles of 45 ° and −45 °, respectively. The angle is not limited to 45 ° and −45 °, and may be 45 ° ± 10 ° and −45 ° ± 10 °. The rotation angle of the in-plane slow axis is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction with reference to the transmission axis of the polarizing film when the optical film is observed from the polarizing film side.

The optical film and the polarizing film are preferably bonded directly or via an adhesive layer or an adhesive layer.
In order to improve the adhesion between the optical film and the polarizing film, the surface of the transparent support is subjected to a surface treatment (eg, glow discharge treatment, corona discharge treatment, plasma treatment, ultraviolet (UV) treatment, flame treatment, saponification treatment, It is preferable to carry out solvent washing.
As the pressure-sensitive adhesive layer, for example, the ratio (tan δ = G ″ / G ′) between the storage elastic modulus G ′ and the loss elastic modulus G ″ measured by a dynamic viscoelasticity measuring device is 0.001 to 1.5. Represents a substance, and includes so-called adhesives and substances that are easy to creep. Examples of the adhesive that can be used in the present invention include, but are not limited to, a polyvinyl alcohol-based adhesive.

<3D image display device>
The present invention also relates to a 3D image display device having the optical film. The film of this invention is arrange | positioned at the visual recognition side of a display panel, and has a function which converts the image which a display panel displays into the circularly polarized image for right eyes and left eyes. An observer observes these images through a polarizing plate such as circularly polarized glasses and recognizes them as a stereoscopic image.

The pixel pitch of the display panel used in the 3D image display device is not particularly limited, but is preferably 10 to 250 μm, more preferably 10 to 130 μm, and further preferably 10 to 80 μm from the viewpoint of being suitable for combination with the optical film. preferable.
The relationship between the pixel pitch of the display panel and each region in the patterned optically anisotropic layer includes the width of the image pitch, the first retardation region and the second retardation region in the patterned optically anisotropic layer. It is preferable that the total width of the width of one of the regions and the width of the boundary line is substantially the same, and the total width is preferably within ± 20% with respect to the width of the image pitch, and within ± 10% More preferably, it is more preferably within ± 5%.

In the present invention, there is no limitation on the display panel. For example, it may be a liquid crystal panel including a liquid crystal layer, an organic EL display panel including an organic EL layer, or a plasma display panel. For any aspect, various possible configurations can be employed. Further, in a mode in which a liquid crystal panel or the like in a transmission mode has a polarizing film for image display on the viewing side surface, the optical film of the present invention may achieve the above function by combination with the polarizing film.

Hereinafter, the present invention will be described in more detail based on examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. Therefore, the scope of the present invention should not be construed as being limited by the examples shown below.

<Example 1>
(Preparation of coating solution for antiglare hard coat layer)
Each component was mixed with a mixed solvent (89 to 11 (mass ratio)) of MIBK (methyl isobutyl ketone) and MEK (methyl ethyl ketone) so as to have the following composition. It filtered with the polypropylene filter with a hole diameter of 30 micrometers, and prepared the coating liquid 1 for anti-glare hard-coat layers. The solid content concentration of the coating solution is 40% by mass.
――――――――――――――――――――――――――――――――――
Composition of Coating Solution 1 for Antiglare Hard Coat Layer ――――――――――――――――――――――――――――――――――
Smectite (Lucentite STN, manufactured by Coop Chemical Co., Ltd.) 1.00 parts by mass Cross-linked acrylic-styrene particles (average particle size 2.5 μm, refractive index 1.52) (manufactured by Sekisui Plastics Co., Ltd.) 8.00 parts by mass acrylate monomer ( NK Ester A9550, manufactured by Shin-Nakamura Chemical Co., Ltd.)
87.79 parts by mass polymerization initiator (Irgacure 907, manufactured by BASF) 3.00 parts by mass leveling agent (P-4) 0.15 parts by mass MIBK (methyl isobutyl ketone) 133.50 parts by mass MEK (methyl ethyl ketone) 50 parts by mass ――――――――――――――――――――――――――――――――――

Note that the above x, y, z, and n are 25, 25, 50, and 8, respectively.

(Coating of antiglare hard coat layer)
A commercially available cellulose acylate TD60 (manufactured by FUJIFILM Corporation) (film thickness: 60 μm) is unwound in a roll form, and the coating solution 1 for antiglare hard coat layer is used, so that the film thickness is 4 μm. An antiglare hard coat layer was applied.
Specifically, in the die coating method using the slot die described in Example 1 of Japanese Patent Application Laid-Open No. 2006-122889, the coating liquid 1 is applied on the support (Cellulose Acylate TD60) under the condition of a conveyance speed of 30 m / min. After coating and drying at 80 ° C. for 150 seconds, using an air-cooled metal halide lamp (manufactured by Eye Graphics) with an oxygen concentration of about 0.1% under a nitrogen purge, an illuminance of 400 mW / cm ² and an irradiation amount The coating layer was cured by irradiating 180 mJ / cm ² of ultraviolet rays to form an antiglare hard coat layer, and then wound up to prepare a support 1 with an antiglare hard coat layer.

(Preparation of alkali saponified support 1)
The produced antiglare hard coat layer-supported support 1 is passed through a dielectric heating roll having a temperature of 60 ° C., and the surface temperature is raised to 40 ° C. An alkaline solution having the composition shown below is continuously applied to the surface opposite to the surface on which the dazzling hard coat layer is formed with a # 6 wire bar, heated to 110 ° C., and manufactured by Noritake Company Limited. For 10 seconds under a steam far infrared heater. Subsequently, 3 ml / m ^{2 of} pure water was applied using the same bar coater. Next, washing with a fountain coater and draining with an air knife were repeated three times, and then transported to a drying zone at 70 ° C. for 10 seconds and dried to prepare an alkali saponified support 1.
──────────────────────────────────
Composition of alkaline solution ──────────────────────────────────
Potassium hydroxide 2.0 parts by weight Water 6.5 parts by weight Isopropanol 85.0 parts by weight Surfactant SF-1: C ₁₄ H ₂₉ O (CH ₂ CH ₂ O) ₂₀ H 0.035 parts by weight Propylene glycol 6. 5 parts by mass──────────────────────────────────

(Preparation of support 1 with alignment film before exposure)
On the surface subjected to the saponification treatment of the prepared support 1 subjected to the alkali saponification treatment, an alignment film forming coating solution 1 having the following composition was continuously applied with a wire bar. Drying with warm air of 60 ° C. for 60 seconds, and further with warm air of 100 ° C. for 120 seconds, the support 1 with an alignment film before exposure was formed. The wire bar was adjusted so that the film thickness of the alignment film before exposure was 0.45 μm.
──────────────────────────────────
Composition of coating liquid 1 for alignment film formation ──────────────────────────────────
Polymer material for alignment film (P-1) 2.4 parts by mass photoacid generator (S-1) 0.17 parts by mass radical polymerization initiator (Irgacure 2959, manufactured by Ciba Specialty Chemicals)
0.18 parts by weight Methanol 16.5 parts by weight IPA (isopropanol) 7.2 parts by weight water 73.55 parts by weight ──────────────────────── ──────────

(UV exposure)
Next, a stripe mask having a transverse stripe width of 96.2 μm at the transmission portion and a transverse stripe width of 96.2 μm at the shielding portion is placed on the above-prepared support 1 with alignment film before exposure, and 200 nm to 40 nm in air at room temperature. Ultraviolet rays are irradiated for 0.06 seconds (irradiation amount 30 mJ / cm ² ) using a light source unit of an ultraviolet irradiation device (Light Hammer 10, 240 W / cm, manufactured by Fusion UV Systems) having an illuminance of 500 mW / cm ² in a wavelength region of 400 nm. Then, a pattern alignment film was formed.

(Formation of striped pattern optically anisotropic layer 1)
The pattern alignment film after the ultraviolet exposure was rubbed once in one direction at 500 rpm while maintaining an angle of 45 ° with respect to the stripe of the stripe mask. Subsequently, the following coating liquid for pattern optical anisotropic layers was apply | coated with the wire bar. Furthermore, after aging for 2 minutes at a film surface temperature of 110 ° C., the sample was cooled to 80 ° C. and irradiated with ultraviolet rays for 20 seconds using an air-cooled metal halide lamp (made by Eye Graphics Co., Ltd.) of 20 mW / cm ² under air. By fixing the orientation state, a stripe-patterned optically anisotropic layer 1 was formed. In the mask exposure portion (first retardation region), the in-plane slow axis direction is parallel to the rubbing direction and the discotic liquid crystalline compound is vertically aligned, and the unexposed portion (second retardation region) is orthogonal. It was vertically aligned. The wire bar was adjusted so that the thickness of the optically anisotropic layer 1 was 1.15 μm.
──────────────────────────────────
Composition of coating solution for pattern optical anisotropic layer──────────────────────────────────
Discotic liquid crystal E-2 100 parts by weight alignment film interface aligner (II-1) 0.95 parts by weight air interface aligner (P-2) 1.0 part by weight photopolymerization initiator (Irgacure 907, Ciba Specialty Chemicals Co., Ltd.) 3.0 parts by mass sensitizer (Kayacure-DETX, Nippon Kayaku Co., Ltd.) 1.0 parts by mass methyl ethyl ketone 400 parts by mass ────────────── ────────────────────

(Preparation of optical film 1)
As described above, the optical film 1 in which the antiglare hard coat layer was formed on one side of the support and the stripe-patterned optically anisotropic layer was formed on the back side was produced.

(Evaluation 1 of optical film 1)
For the produced optical film 1, using KOBRA-21ADH (manufactured by Oji Scientific Instruments), the tilt angle of the discotic liquid crystal at the alignment film interface, the tilt angle of the discotic liquid crystal at the air interface, and Re (550) As a result of measurement, the tilt angle of the discotic liquid crystal at the air interface and the alignment film interface was vertical, and Re (550) was 130 nm. Note that “vertical” represents a tilt angle of 70 ° to 90 °.

Two polarizing plates in which the in-plane slow axis of either the first retardation region or the second retardation region is combined in an orthogonal position with the stripe-patterned optically anisotropic layer of the produced optical film 1 In addition, a sensitive color plate having a phase difference of 530 nm is placed between the polarizing plates so as to be parallel to one of the transmission axes, and an in-plane slow axis forms an angle of 45 ° with the transmission axis of the polarizing plate. And placed on the patterned optically anisotropic layer. Next, as a result of observing a state in which the patterned optically anisotropic layer was rotated by + 45 ° and a state in which the patterned optically anisotropic layer was rotated by −45 ° with a polarizing microscope (ECLIP E600W POL manufactured by NIKON), Since the in-plane slow axis of the phase difference region and the in-plane slow axis of the sensitive color plate are parallel, the phase difference is larger than 530 nm, the color changes to blue, and the second phase difference region Since the in-plane slow axis was orthogonal to the in-plane slow axis of the sensitive color plate, the phase difference was smaller than 530 nm, and the color changed to yellow. Further, since the reverse phenomenon occurs when rotated by −45 °, the in-plane slow axes of the first retardation region and the second retardation region are + 45 ° and − It was confirmed that the angle was 45 °.

Next, the striped pattern optically anisotropic layer of the produced optical film 1 with the sensitive color plate removed has an in-plane slow axis in either the first retardation region or the second retardation region. The polarizing plate (ECLIP E600W POL manufactured by NIKON) was placed so as to be parallel to the transmission axis of one of the two polarizing plates combined in an orthogonal position. At this time, the first phase difference region and the second phase difference region were dark and the boundary line looked bright. Moreover, the observed image was taken into a PC from a digital camera (NIKON DIGITAL CAMERA DXM1200) attached to a polarizing microscope. From this image, using the image analysis software WinROOF (Mitani Corporation), the width W1 of the first retardation region and the second retardation region in the stripe pattern optically anisotropic layer schematically shown in FIG. The width W2 and the width W3 of the boundary line were measured by the method described above. The width W1 and the width W2 measured by the above method were 91.2 μm, and the width W3 was 5.0 μm.

From the above results, the PVA-rubbed alignment film containing the photoacid generator is subjected to mask exposure, and then the discotic liquid crystal is aligned on the alignment film that has been rubbed in one direction, thereby achieving vertical alignment and surface It is possible to obtain a patterned optically anisotropic layer having a first retardation region (Re (550) = 130 nm) and a second retardation region (Re (550) = 130 nm) whose inner slow axes are orthogonal to each other. Understandable.

(Production of 3D image display device 1)
The striped pattern optically anisotropic layer side of the optical film 1 produced above was bonded to the viewing side polarizing plate of an Apple tablet, i Pad Retina display model, and the 3D image display device 1 shown in Table 1 was produced. . When bonding, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region are 45 ° and −45 ° with respect to the transmission axis of the polarizing plate in the tablet, respectively. It was arranged to be °. The angle is expressed as a positive angle value in the clockwise direction and a negative angle value in the counterclockwise direction when the display is observed from the optical film 1 side with the transmission axis of the polarizing film as 0 ° as a reference. Further, the centers of the widths of the first phase difference region and the second phase difference region are arranged so as to match the center of the pixel pitch width of the display panel. Regarding the 3D image display devices 2 to 10 described later, the relationship between the in-plane slow axis of the first retardation region and the second retardation region and the transmission axis of the polarizing plate, and the first retardation region and the second retardation region Bonding was performed so that the positional relationship between the phase difference region and the pixel pitch of the display panel is the above-described mode.
A partial enlarged cross-sectional view of the formed 3D image display device 1 is shown in FIG. The configuration of the 3D image display device 10d is substantially the same as the embodiment of FIG. 1 except that the optical film 100 is used, and the same members are denoted by the same reference numerals. In FIG. 6, only the striped pattern optically anisotropic layer in the optical film 1 is shown, and other configurations (for example, alignment films) are omitted. In FIG. 6, W3 represents the width of the boundary line, W4 represents the pixel pitch, W5 represents the width of the black matrix (BM), T1 represents the thickness of the glass substrate, and T2 represents the thickness of the polarizing film.

<Example 2>
(Preparation of optical film 2)
Instead of a stripe mask with a horizontal stripe width of 96.2 μm at the transparent portion and a horizontal stripe width of 96.2 μm at the shield portion, a stripe mask with a horizontal stripe width of 77.9 μm at the transparent portion and a horizontal stripe width of 77.9 μm at the shield portion is used. An optical film 2 having a striped pattern optically anisotropic layer 2 was produced in the same manner as in Example 1 except that. In the striped pattern optically anisotropic layer 2, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of optical film 2)
About the produced optical film 2, when the same evaluation as the above (Evaluation 1 of the optical film 1) was performed, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region were The tilt angles of the discotic liquid crystals perpendicular to each other at the air interface and the alignment film interface were vertical, and Re (550) was 130 nm.

(Production of 3D image display device 2)
The striped pattern optically anisotropic layer side of the optical film 2 produced above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, and the 3D image display device 2 shown in Table 2 was produced.

<Example 3>
(Preparation of optical film 3)
Optical having striped pattern optically anisotropic layer 3 in the same manner as in Example 2 except that ZEONOR film ZF14 (manufactured by Nippon Zeon Co., Ltd.) (thickness: 100 μm) was used instead of cellulose acylate TD60. Film 3 was produced. In the striped pattern optically anisotropic layer 3, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of optical film 3)
About the produced optical film 3, when the same evaluation as the above (Evaluation 1 of the optical film 1) was performed, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region were The tilt angle of the discotic liquid crystal perpendicular to each other at the air interface and the alignment film interface was vertical, and Re (550) was 128 nm.

(Production of 3D image display device 3)
The striped pattern optically anisotropic layer side of the optical film 3 produced above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, and the 3D image display device 3 shown in Table 2 was produced.

<Example 4>
(Preparation of optical film 4)
An optical film 4 having a striped pattern optically anisotropic layer 4 in the same manner as in Example 2 except that ACRYPET VH (manufactured by Mitsubishi Rayon Co., Ltd.) (thickness 60 μm) was used instead of Cellulose Acylate TD60. Was made. In the striped pattern optically anisotropic layer 4, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of optical film 4)
About the produced optical film 4, when the same evaluation as the above (Evaluation 1 of the optical film 1) was performed, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region were The tilt angles of the discotic liquid crystals perpendicular to each other at the air interface and the alignment film interface were vertical, and Re (550) was 130 nm.

(Preparation of 3D image display device 4)
The striped pattern optically anisotropic layer side of the optical film 4 produced above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, to produce the 3D image display device 4 shown in Table 2.

<Example 5>
(Preparation of optical film 5)
An optical element having a striped pattern optically anisotropic layer 5 in the same manner as in Example 2 except that a polyethylene terephthalate film (manufactured by FUJIFILM Corporation) (thickness 75 μm) is used in place of the cellulose acylate TD60. Film 5 was produced. In the striped pattern optically anisotropic layer 5, the width W1 and the width W2 were 72.9 μm, and the width W3 was 5.0 μm.

(Evaluation of optical film 5)
About the produced optical film 5, when the same evaluation as the above (Evaluation 1 of the optical film 1) was performed, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region were The tilt angles of the discotic liquid crystals perpendicular to each other at the air interface and the alignment film interface were vertical, and Re (550) was 138 nm.

(Preparation of 3D image display device 5)
The striped pattern optically anisotropic layer side of the optical film 5 produced above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, and the 3D image display device 5 shown in Table 2 was produced.

<Example 6>
(Preparation of optical film 6)
In the above (ultraviolet exposure), the illuminance in the wavelength region of 200 nm to 400 nm is changed from 500 mW / cm ² to 150 mW / cm ² , and the irradiation time is changed from 0.06 seconds (irradiation amount 30 mJ / cm ² ) to 0.14 seconds. An optical film 6 having a striped pattern optically anisotropic layer 6 was produced in the same manner as in Example 2 except that the irradiation dose was changed to 21 mJ / cm ² . In the striped pattern optically anisotropic layer 6, the width W1 and the width W2 were 69.9 μm, and the width W3 was 8.0 μm.

(Evaluation of optical film 6)
About the produced optical film 6, when the same evaluation as the above (Evaluation 1 of the optical film 1) was performed, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region were The tilt angles of the discotic liquid crystals perpendicular to each other at the air interface and the alignment film interface were vertical, and Re (550) was 125 nm.

(Production of 3D image display device 6)
The striped pattern optically anisotropic layer side of the optical film 6 produced above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, and the 3D image display device 6 shown in Table 2 was produced.

<Example 7>
(Preparation of optical film 7)
In the above (ultraviolet exposure), the same operation as in Example 6 except that the irradiation time was changed from 0.14 second (irradiation amount 21 mJ / cm ² ) to 0.12 second (irradiation amount 18 mJ / cm ² ). The optical film 7 having the stripe-shaped optically anisotropic layer 7 was prepared. In the striped pattern optically anisotropic layer 7, the width W1 and the width W2 were 67.9 μm, and the width W3 was 10.0 μm.

(Evaluation of optical film 7)
About the produced optical film 7, when the same evaluation as the above (Evaluation 1 of the optical film 1) was performed, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region were The tilt angles of the discotic liquid crystals perpendicular to each other at the air interface and the alignment film interface were vertical, and Re (550) was 125 nm.

(Production of 3D image display device 7)
The striped pattern optically anisotropic layer side of the optical film 7 prepared above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, and the 3D image display device 7 shown in Table 2 was prepared.

<Comparative Example 1>
(Preparation of support 8 with photo-alignment film)
A coating solution 2 for forming a photo-alignment film mainly comprising polynorbornene and an acrylate monomer described in JP 2012-517024 A on the surface subjected to the saponification treatment of the support 1 subjected to the alkali saponification treatment prepared in Example 1. Was continuously applied with a wire bar. The substrate was dried with warm air of 80 ° C. for 120 seconds to form a support 8 with a polycinnamate photo-alignment film. The wire bar was adjusted so that the thickness of the polycinnamate photo-alignment film (pre-exposure photo-alignment film) was 0.1 μm.
──────────────────────────────────
Composition of coating liquid 2 for photo-alignment film formation ──────────────────────────────────
Polynorbornene (hereinafter structural formula) (Mw = 150,000) 2.0 parts by mass Pentaerythritol triacrylate 1.0 part by mass radical polymerization initiator (Irgacure 907, manufactured by BASF) 0.25 parts by mass cyclohexanone 96.75 parts by mass ──────────────────────────────────

(Polarized UV exposure)
Next, a stripe mask having a transverse stripe width of 96.2 μm at the transmission portion and a transverse stripe width of 96.2 μm at the shielding portion is disposed on the prepared support 8 with the polycinnamate photo-alignment film, and is allowed to stand at room temperature in air. Ultraviolet rays were irradiated using a 160 W / cm ² air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.). At this time, as shown in FIG. 7A, a wire grid polarizer (manufactured by Moxtek, ProFlux PPL02) is set in the direction 1, and further mask A (transmission part horizontal stripe width 96.2 μm, shielding part The exposure was carried out through a stripe mask having a horizontal stripe width of 96.2 μm. Thereafter, as shown in FIG. 7B, the wire grid polarizer is set in the direction 2, and the mask B (a stripe mask with a transverse stripe width of 96.2 μm at the transmission portion and a transverse stripe width of 96.2 μm at the shielding portion). ) To perform exposure. The distance between the exposure mask surface and the photo-alignment film was set to 200 μm. The pattern alignment film was formed by setting the illuminance of ultraviolet rays used at this time to 100 mW / cm ^{2 in} the UV-A region (integration of wavelengths from 380 nm to 320 nm) and to 1000 mJ / cm ² in the UV-A region.

(Formation of striped pattern optically anisotropic layer 8)
A coating solution for a patterned optical anisotropic layer described in JP-T-2012-517024 was applied to the patterned alignment film after UV exposure using a wire bar. Further, after drying at a film surface temperature of 105 ° C. for 120 seconds to obtain a liquid crystal phase state, it is cooled to 75 ° C., and an air-cooled metal halide lamp (manufactured by Eye Graphics Co., Ltd.) of 160 W / cm ² is used under air. The optical film 8 having the striped pattern optically anisotropic layer 8 was prepared by fixing the alignment state by irradiating ultraviolet rays. The wire bar was adjusted so that the thickness of the patterned optically anisotropic layer was 1.3 μm. In the stripe-patterned optically anisotropic layer 8, the width W1 and the width W2 were 83.2 μm, and the width W3 was 13.0 μm.

──────────────────────────────────
Coating solution for pattern optical anisotropic layer ------------------------
Rod-shaped liquid crystalline compound (LC242, manufactured by BASF Corporation) 100 parts by mass horizontal alignment agent A 0.3 parts by mass photopolymerization initiator 3.3 parts by mass (Irgacure 907, manufactured by Ciba Specialty Chemicals Co., Ltd.)
Sensitizer (Kayacure-DETX, Nippon Kayaku Co., Ltd.) 1.1 parts by weight Methyl ethyl ketone 300 parts by weight ───────────────────────── ─────────

(Preparation of optical film 8)
As described above, an optical film 8 was produced in which an antiglare hard coat layer was formed on one side of a support and a striped pattern optically anisotropic layer was formed on the back side.
When the optical film 8 was observed with a polarizing microscope in accordance with the same procedure performed in (Evaluation 1 of the optical film 1), the first retardation region and the second retardation region were observed with respect to the transmission axis of the polarizing plate. It was confirmed that the in-plane slow axis formed angles of + 45 ° and −45 °, respectively. That is, the in-plane slow axis of the first phase difference region and the in-plane slow axis of the second phase difference region were orthogonal.

(Evaluation of optical film 8)
About the produced optical film 8, according to the above method using KOBRA-21ADH (manufactured by Oji Scientific Instruments), the tilt angle of the rod-like liquid crystalline compound at the alignment film interface, the tilt angle of the rod-like liquid crystalline compound at the air interface, and As a result of measuring Re (550), the tilt angle of the rod-like liquid crystal compound at the air interface and the alignment film interface was horizontal, and Re (550) was 130 nm. Note that horizontal means a tilt angle of 0 ° to 20 °.

(Production of 3D image display device 8)
The striped pattern optically anisotropic layer side of the optical film 8 produced above was bonded to the viewing side polarizing plate of an Apple tablet, i Pad Retina display model, and the 3D image display device 8 shown in Table 1 was produced. .

<Comparative example 2>
(Preparation of optical film 9)
In the above (ultraviolet exposure), the same operation as in Example 6 except that the irradiation time was changed from 0.14 second (irradiation amount 21 mJ / cm ² ) to 0.10 second (irradiation amount 15 mJ / cm ² ). The optical film 9 having the stripe-shaped optically anisotropic layer 9 was prepared. In the striped pattern optically anisotropic layer 9, the width W1 and the width W2 were 64.9 μm, and the width W3 was 13.0 μm.

(Evaluation of optical film 9)
When the same evaluation as the above (Evaluation 1 of optical film 1) was performed on the produced optical film 9, the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region were determined. The tilt angles of the discotic liquid crystals perpendicular to each other at the air interface and the alignment film interface were vertical, and Re (550) was 125 nm.

(Preparation of 3D image display device 9)
The striped pattern optically anisotropic layer side of the optical film 9 produced above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, to produce the 3D image display device 9 shown in Table 2.

<Comparative Example 3>
(Preparation of optical film 10)
An optical film 10 having a striped pattern optically anisotropic layer 10 was produced in the same manner as in Comparative Example 1 except that the stripe width of the mask A and the mask B was changed from 96.2 μm to 77.9 μm. In the striped pattern optically anisotropic layer 10, the width W1 and the width W2 were 64.9 μm, and the width W3 was 13.0 μm.

(Evaluation of optical film 10)
For the produced optical film 10, the KOBRA-21ADH (manufactured by Oji Scientific Instruments) was used to set the tilt angle of the rod-like liquid crystal at the alignment film interface, the tilt angle of the rod-like liquid crystal at the air interface, and Re (550), respectively. As a result of the measurement, the tilt angle of the liquid crystal at the air interface and the alignment film interface was horizontal, and Re (550) was 130 nm. Note that horizontal means a tilt angle of 0 ° to 20 °.

(Production of 3D image display device 10)
The striped pattern optically anisotropic layer side of the optical film 10 produced above was bonded to the viewing side polarizing plate of an Apple smartphone, iPhone 5, and the 3D image display device 10 shown in Table 2 was produced.

<Evaluation of 3D image display device>
(Evaluation of vertical crosstalk)
The 3D image display device produced as described above displays a full-screen white display as a right-eye image / a full-screen black image as a left-eye image, and the right eye of 3D glasses on the lens of a luminance meter BM-5A manufactured by Topcon Technohouse. The portion was attached, and the luminance was measured in 1 ° increments in the vertical angle range of + 3 ° to -3 °. Similarly, the left eye part of 3D glasses was attached to the lens of BM-5A, and the luminance was measured in increments of 1 ° in the vertical angle range of + 3 ° to −3 °. The luminance measured at the left eye portion of the 3D glasses is divided by the luminance measured at the right eye portion of the 3D glasses, and a value obtained by multiplying by 100 is crosstalk ((the luminance X measured at the left eye portion / the luminance Y measured at the right eye portion). ) × 100) (%). "C" when crosstalk is less than 5%, "B" when 5% or more and less than 6%, "C" when 6% or more and less than 7%, and 7% or more Was evaluated as “D”. The measurement results are shown in Tables 1 and 2. In practice, it is desirable that there is no “D”.
For Examples 2 to 7 and Comparative Examples 2 to 3, the luminance was measured in increments of 1 ° within a polar angle range of + 2 ° to −2 °.
Also, the evaluation result at a polar angle of 1 °, the evaluation result at -1 °, the evaluation result at a polar angle of 2 °, the evaluation result at -2 °, the evaluation result at a polar angle of 3 ° and the evaluation result at -3 ° Since the evaluation results are the same as each other, Table 1 below shows only the results of polar angles 1 °, 2 °, and 3 °, and Table 2 shows only the results of polar angles 1 ° and 2 °.
In Tables 1 and 2, width W4, thickness T1, thickness T2, and width W5 represent the size of each component shown in FIG.

 

As can be seen from the results in Tables 1 and 2, it was confirmed that the use of the optical film of the present invention suppresses the occurrence of crosstalk even in a high-definition display panel with a short image pitch.
On the other hand, as can be seen from the comparison between Example 1 and Comparative Example 1 and the comparison between Examples 2 to 7 and Comparative Examples 2 to 3, the polar angle is large when the width of the boundary line is equal to or larger than a predetermined value. As a result, it was confirmed that crosstalk occurred. In particular, it was confirmed that the occurrence of crosstalk is further suppressed when the width of the boundary line is 8 μm or less (more preferably, 5 μm or less).

10a, 10b, 10c, 10d 3D image display device 12 Display panel 14 Glass substrate 16, 140 Polarizing film 18 Striped pattern optical anisotropic layer 20 Black matrix 22, 130 Boundary line 100 Pattern optical anisotropic layer 110 First place Phase difference region 120 Second phase difference region

Claims (12)

1. A display panel;
   An optical film having a patterned optical anisotropic layer disposed on the viewing side of the display panel,
   The patterned optically anisotropic layer has a first retardation region and a second retardation region in which at least one of an in-plane slow axis direction and an in-plane retardation is different from each other, the first retardation region and the first retardation region The two phase difference regions are alternately arranged in stripes within the same plane, and the width of the first phase difference region and the width of the second phase difference region are 50 to 250 μm,
   A 3D image display device, wherein a boundary line made of a non-oriented region located at a boundary between the first retardation region and the second retardation region has a width of 0.1 to 10 μm.
2. The 3D image display device according to claim 1, wherein an in-plane slow axis direction of the first phase difference region and an in-plane slow axis direction of the second phase difference region are orthogonal to each other.
3. The 3D image display device according to claim 1 or 2, wherein an in-plane retardation Re (550) at a wavelength of 550 nm of the first retardation region and the second retardation region is 110 to 160 nm.
4. 4. The 3D image display device according to claim 1, wherein a width of the first retardation region and a width of the second retardation region are 50 to 80 μm.
5. The 3D image display device according to any one of claims 1 to 4, wherein the patterned optically anisotropic layer is disposed on a transparent support.
6. The 3D image display device according to any one of claims 1 to 5, wherein a pixel pitch of the display panel is 10 to 250 µm.
7. An optical film having a patterned optically anisotropic layer,
   The patterned optically anisotropic layer has a first retardation region and a second retardation region in which at least one of an in-plane slow axis direction and an in-plane retardation is different from each other, the first retardation region and the first retardation region The two phase difference regions are alternately arranged in stripes within the same plane, and the width of the first phase difference region and the width of the second phase difference region are 50 to 250 μm,
   An optical film in which a width of a boundary line composed of a non-oriented region located at a boundary between the first retardation region and the second retardation region is 0.1 to 10 μm.
8. The optical film according to claim 7, wherein an in-plane slow axis direction of the first retardation region and an in-plane slow axis direction of the second retardation region are orthogonal to each other.
9. The optical film according to claim 7 or 8, wherein an in-plane retardation Re (550) at a wavelength of 550 nm of the first retardation region and the second retardation region is 110 to 160 nm.
10. 10. The optical film according to claim 7, wherein a width of the first retardation region and a width of the second retardation region are 50 to 80 μm.
11. The optical film according to any one of claims 7 to 10, wherein the patterned optically anisotropic layer is disposed on a transparent support.
12. The optical film according to any one of claims 7 to 10, and a polarizing film,
    One of the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region forms an angle of + 45 ° with respect to the transmission axis of the polarizing film, and the transmission axis of the polarizing film In contrast, the other of the in-plane slow axis of the first retardation region and the in-plane slow axis of the second retardation region forms an angle of −45 °.
    
    

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